Inversion Method of Deep Horizontal In-situ Stress Based on Borehole Deformation

doi:10.11885/j.issn.1674-5086.2024.03.11.03

Abstract

Abstract: Based on the relationship between borehole deformation and in-situ stress state under non-uniform horizontal in-situ stress, an inversion method of deep horizontal in-situ stress was proposed based on borehole deformation. Firstly, based on the classical Krisch borehole stress equation and constitutive model, the inversion model of the horizontal in-situ stress was derived by using borehole deformation. Secondly, the inversion model was verified by finite element method. Then, the effects of wellbore pressure, formation lithology, horizontal differential stress, borehole size and inclination on the inversion of horizontal in-situ stress were analyzed using the finite element method. Finally, the applicability of this method is validated using measured data from two vertical wells in Alberta, Canada. The results indicate that the borehole deformation under the action of nonuniform horizontal in-situ stress is elliptical, and the inversion of the horizontal in-situ stress is related to the major and minor axes of the ellipse. The accuracy of the inversion model is verified by finite element simulation, and the inversion errors of the maximum and minimum horizontal in-situ stress are 0.001% and 0.052%, respectively. Different wellbore pressure, horizontal differential stress, borehole size and formation lithology have little effect on the inversion of horizontal in-situ stress, and the inversion error is <0.1%. However, borehole inclination has a significant effect on the in-situ stress inversion, and the inversion error of the horizontal in-situ stress is <0.4% when the borehole inclination is 65°. The analysis results of two case wells show that the inversion errors of the maximum and minimum horizontal in-situ stress are <5.5%, which further verifies the accuracy of this method. This study provides a new approach and method for in-situ measurement and inversion of horizontal in-situ stress in deep oil and gas wells.

Key words: in-situ stress, borehole deformation, horizontal in-situ stress, inversion method, finite element simulation

CLC Number:

TE21

MA Tianshou, CHEN Jie, LIU Yang, JIA Lichun, XU Honglin. Inversion Method of Deep Horizontal In-situ Stress Based on Borehole Deformation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(3): 144-154.

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